While it may not be ideal for Nintendo, it may not be so bad for them to be a secondary console, as long as they make a good enough profit, right?

Isn't it when you look at the financials of Nintendo and Sony's gaming divisions that Nintendo made more profit than Sony even during the PS2 era?

Being #1 doesn't always mean something. Heck, Apple isn't dwarfed by the Android market, yet the are making more money than all of them combined.

I like how you ignored the first, primary, question and focused on something that hasn't even been proven to be an issue for Switch yet. Afterall, for the first two years Wii was sold out and sold regularly on eBay for 2 to 3 times its $250 price. 

You do have to remember, the system markets itself.
The games (Mario Kart) are fun enough that people who play split screen once may be tempted to buy despite the price.
Don't forget that many people buy a new phone almost yearly, and the Switch is cheaper than a new flagship phone (I have seen casuals justify the purchase this way for the price of $470 AUD).

Yeah, that's about how I feel. As long as the system sells well enough and turns in a good profit for Nintendo.

your logic doesn't equate, HANDHELD gamers who want a system basically only have the Switch has a choice so its not a direct comparison with the PS4 and Xone.

Its a home + handheld system which on its own, regardless of the library, is insanely appealing. 

realistically even something like the 3DS outside of Capcom (Monster Hunter) basically soley depending on Nintendo's first party titles yet has sold 60 something million. The concept that you need the EA/Activision type of games to sell a system is absurd, there are plenty of gamers interested in Indie, niche third party, and Nintendo. At any rate just the fact that we have EA doing a new (ish) Fifa on the Switch and Bethesda porting Skyrim- thats a good sign of things to come

the reality is though if the Switch sells well in the next 6 months the third parties will come. 

and honestly if you don't want to buy the Switch OP, then fair enough, but Nintendo has proven multiple times before, especially with their handheld systems, that third party is not always crucial 

Huge 3rd party support, isn't going to win that many people back that have moved on to other consoles. The numbers may be what 10% greater?

Nintendo needs to find a way to retain the kids they have as they mature. In 15 years time their base should expand this way if the kids don't abandon them at 13-15

It's okay, apology accepted. The Switch will be just fine!

Wii didn't have big third party support, it did okay. I don't think 3rd parties are a huge factor for Nintendo, not since the early 90's, to be honest. And, I also wonder what "failing" means in the OP's mind? Is there a specific number?

I don't see how the 3DS successor, which can also be played on the big screen at home with better performances, can fail.